Single Comment

I've been toying with a similar idea for the last couple of days and
decided to google it. I'm happy to see other people have also thought of
this.
All in all, I like your initial board setup but I don't like the knight
movement change and the pawn promotion rules are hard to learn. Diagonal
chess should be casual, fun and easy, when you are bored of the normal
one!
In my current design, pawn promotion only happens at the very last square
(H8). This might seem near impossible to achieve, but my pawn movement is
also different. You can move them in either diagonal and only eat straight
forward. Exactly the opposite of the image above. This makes the game
completely different and quite fun, as you can group pawns from different
lanes together in creative formations.
I have also toyed with dropping one of the bishops instead of the 8th pawn.
The initial board setup is thus different, with a knight by each rook, the
8th pawn in the center, and the queen and bishop adjacent to the king.